American Cancer Society
What is radon? How are people exposed to radon? Does radon cause cancer? Radon studies results.
National Cancer Institute
Radon and Cancer - Questions and Answers Fact Sheet
American Lung Association
How serious a problem is radon in the U.S.? How does radon get indoors? Health effects of radon.
Environmental Protection Agency
A citizens guide to radon: The guide to protecting yourself and your family from radon.
Washington State Department of Health
How can radon affect me? How can I tell if I have radon in my house?
Oregon State Department of Health
What are the health risks? How does radon enter a home?
Idaho State Department of Health and Welfare
Radon could be in your home. Lowering your radon levels.